Are you using this code to connect?
2-3 finger print sensör
lcd and button not solve 
Could you help?
#include <LiquidCrystal.h>
#include <Adafruit_Fingerprint.h>
#if ARDUINO >= 100
#include <SoftwareSerial.h>
#else
#include <NewSoftSerial.h>
#endif
int getFingerprintIDez();
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino (WHITE wire)
SoftwareSerial mySerial(2, 3);
LiquidCrystal lcd(5, 6, 7, 8, 9, 10); // initialize the library with the numbers of the interface pins
int buttonState = 0;
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
void setup()
{
Serial.begin(9600); // initialize the serial communications:
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("Scan your finger");
pinMode(13,OUTPUT);
pinMode(12,OUTPUT);
pinMode(11, OUTPUT);
pinMode(A0, INPUT);
pinMode(A1, INPUT);
finger.begin(57600); // set the data rate for the sensor serial port
}
void loop() // run over and over again
{
buttonState = digitalRead(A1);
uint8_t id = 0;
if (buttonState == HIGH)
{
id++;
getFingerprintEnroll(id);
delay(100);
digitalWrite (11,HIGH);
}
else{
getFingerprintID();
delay(100);
digitalWrite (13,HIGH);
}
}
uint8_t getFingerprintID()
{
uint8_t p = finger.getImage();
switch (p)
{
case FINGERPRINT_OK:
lcd.clear();
lcd.print(" Image taken... ");
delay(1000);
break;
case FINGERPRINT_NOFINGER:
return p;
case FINGERPRINT_PACKETRECIEVEERR:
return p;
case FINGERPRINT_IMAGEFAIL:
return p;
default:
return p;
}
// OK success!
p = finger.image2Tz();
switch (p) {
case FINGERPRINT_OK:
break;
case FINGERPRINT_IMAGEMESS:
return p;
case FINGERPRINT_PACKETRECIEVEERR:
return p;
case FINGERPRINT_FEATUREFAIL:
return p;
case FINGERPRINT_INVALIDIMAGE:
return p;
default:
return p;
}
// OK converted!
p = finger.fingerFastSearch();
if (p == FINGERPRINT_OK)
{
lcd.clear();
lcd.print(" Found match! ");
digitalWrite(11, HIGH);
delay(1000);
digitalWrite(11,LOW); // turn on green LED to indicate match
}
else if(p == FINGERPRINT_NOTFOUND)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" Did not match! ");
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" scan finger! ");
return p;
}
else
{
return p;
}
// IF FOUND A MATCH............
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Found ID #");
lcd.print(finger.fingerID);
lcd.setCursor(0,1);
lcd.print("confidence ");
lcd.print(finger.confidence);
}
// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
uint8_t p = finger.getImage();
if (p != FINGERPRINT_OK) return -1;
p = finger.image2Tz();
if (p != FINGERPRINT_OK) return -1;
p = finger.fingerFastSearch();
if (p != FINGERPRINT_OK) return -1;
// found a match!
digitalWrite(13, LOW);
delay(10);
digitalWrite(13, HIGH);
delay(10);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Found ID # ");
lcd.print(finger.fingerID);
lcd.setCursor(0, 1);
lcd.print("confidence ");
lcd.print(finger.confidence);
return finger.fingerID;
}
uint8_t getFingerprintEnroll(uint8_t id) {
uint8_t p = -1;
lcd.clear();
lcd.print("Scan for Enroll");
while (p != FINGERPRINT_OK) {
p = finger.getImage();
switch (p) {
case FINGERPRINT_OK:
lcd.clear();
lcd.print(" Image taken... ");
delay(1000);
break;
case FINGERPRINT_NOFINGER:
return p;
case FINGERPRINT_PACKETRECIEVEERR:
return p;
case FINGERPRINT_IMAGEFAIL:
return p;
default:
return p;
}
}
// OK success!
p = finger.image2Tz(1);
switch (p) {
case FINGERPRINT_OK:
break;
case FINGERPRINT_IMAGEMESS:
return p;
case FINGERPRINT_PACKETRECIEVEERR:
return p;
case FINGERPRINT_FEATUREFAIL:
return p;
case FINGERPRINT_INVALIDIMAGE:
return p;
default:
return p;
}
lcd.clear();
lcd.print("Remove finger ");
delay(2000);
p = 0;
while (p != FINGERPRINT_NOFINGER) {
p = finger.getImage();
}
p = -1;
lcd.clear();
lcd.print("Rescan finger");
while (p != FINGERPRINT_OK) {
p = finger.getImage();
switch (p) {
case FINGERPRINT_OK:
lcd.clear();
lcd.print(" Image taken... ");
delay(1000);
break;
case FINGERPRINT_NOFINGER:
return p;
case FINGERPRINT_PACKETRECIEVEERR:
return p;
case FINGERPRINT_IMAGEFAIL:
return p;
default:
return p;
}
}
// OK success!
p = finger.image2Tz(2);
switch (p) {
case FINGERPRINT_OK:
break;
case FINGERPRINT_IMAGEMESS:
return p;
case FINGERPRINT_PACKETRECIEVEERR:
return p;
case FINGERPRINT_FEATUREFAIL:
return p;
case FINGERPRINT_INVALIDIMAGE:
return p;
default:
return p;
}
// OK converted!
p = finger.createModel();
if (p == FINGERPRINT_OK) {
lcd.clear();
lcd.print("Prints matched!");
}
else if (p == FINGERPRINT_PACKETRECIEVEERR) {
return p;
}
else if (p == FINGERPRINT_ENROLLMISMATCH) {
return p;
}
else {
return p;
}
p = finger.storeModel(id);
if (p == FINGERPRINT_OK) {
lcd.clear();
lcd.print("Stored!");
}
else if (p == FINGERPRINT_PACKETRECIEVEERR) {
return p;
}
else if (p == FINGERPRINT_BADLOCATION) {
return p;
}
else if (p == FINGERPRINT_FLASHERR) {
return p;
}
else {
return p;
}
}